紫外多阳极(128×128)微通道阵列光电倍增管的研制

详细报道了新研制的紫外多阳极微通道阵列光电倍增管。该器件采用了叠合式阵列阳极(128×128)、端窗式“日盲”紫外光电阴极(碲铷RbTe)、高增益的Z型微通道板组件、近贴聚焦结构等先进技术。器件的主要性能参数为阴极发射灵敏度18 mA/W,增益2×10     

单电子脉冲的多道快速检测

采用MCP、光子学传输、计算机控制光电二极管阵列构成了可用于电子谱的多道检测系统。与一般光谱探测器不同，该系统在单电子脉冲计数方式下工作，与计算机适配性好，并有极低的检测下限。曾设计了放大、采样保持、阈值辨别以及移位寄存等硬件电路和以并行采集、真伪判别为主的软件程序。软件划分64像素为16道，以1000～7140次/s的频率扫描，饱和计数率可高达105次/s。同时给出该系统初步的实验结果，对此探测器在实际X射线光电子能谱仪中应用的优越性作了评论。     

阵列NaI(Tl)探测器γ能谱合成方法探讨

介绍两路或多路NaI(Tl)探测器γ能谱数据的合成方法及初步成果,以"特征峰叠加"的方法对137Cs和60Co的仪器谱进行单峰和双峰的叠加试验,为天然γ能谱合成提供依据.实验表明,"特征峰叠加"的方法可较好地反映各仪器谱合成前的特性,有很好的应用前景.     

铝合金Ti(C,N)/TiN多元多层膜与阳极氧化膜性能比较

分别采用多弧离子镀技术及阳极氧化技术在LF6防锈铝基体表面制备了Ti(C,N)/TiN/Ti(C,N)/TiN/ Ti(C,N)/TiN六层多元多层膜及阳极氧化膜,并对比考察研究了该两种膜的力学性能和摩擦学性能,结果表明:多元多层膜与阳极氧化膜划痕临界荷载分别为76N,60N;显微硬度分别为HV0.251404,HV0.25520;二者摩擦系数都较高,分别为0.66,0.76;都使对偶件磨损;但与传统的阳极氧化膜相比,多元多层膜硬度与耐磨性都提高了近2倍,且其摩擦曲线平滑,呈稳定磨损状态,而阳极氧化膜摩擦曲线呈跳跃状,呈非稳定磨损状态.     

聚苯乙烯微球的制备及其在光子晶体中的应用

亚微米级聚苯乙烯微球是一类常见的制备光子晶体的材料。综述了分散聚合法和乳液聚合法制备光子晶体用单分散聚苯乙烯微球的研究进展;介绍了聚苯乙烯胶体球在蛋白石结构、反蛋白石结构和可调制光子晶体中的应用进展;并提出了今后的研究方向。     

TC4钛合金表面阳极氧化制备TiO_2多孔膜的实验研究

以硫酸为电解液,钛合金(TC4)为阳极,不锈钢片为阴极,采用恒压的氧化方式在钛合金表面获得TiO2多孔膜。通过扫描电镜(SEM)观察了多孔膜的微观形貌并用X射线衍射(XRD)对覆在钛合金基体上的氧化膜进行了物相分析,研究了氧化工艺参数电压、阳极氧化时间和硫酸浓度对TiO2多孔膜相组成的影响。结果表明:TC4钛合金阳极氧化获得的氧化膜为非均一平面的TiO2多孔膜,且膜的孔径分布在90~240nm,XRD分析表明在不同的氧化工艺参数下氧化膜均由锐钛相和金红石相双相晶型组成。在0.5mol/L硫酸溶液中,电压高于100V或氧化时间长于5min即出现锐钛相和金红石相TiO2,随着电压的升高和时间的增长金红石相TiO2的含量逐渐增加;在恒压120V时,硫酸溶液浓度为0.3mol/L即出现锐钛相和金红石相TiO2,随着硫酸浓度的提高金红石相TiO2的含量先增加后减少。     

微通道换热器及其在制冷空调领域的应用前景

微通道换热器以其高效的换热性能、紧凑的结构及成本上的优势,正逐步应用于商业、家用制冷空调行业,与其相关的研究受到越来越多的关注,成为相关领域的一个研究热点。本文分析微通道换热器的优势及其应用于制冷空调领域所产生的效益;指出当前微通道换热器应用于制冷空调领域存在的问题,包括可靠性和换热性能;分析在提高微通道换热器性能上所采取的措施及其发展趋势。     

微条气体室(MSGC)基板材料的研究

根据微条气体室(MSGC)探测器的工作原理,分析了MSGC基板的选择依据,同时首次提出采用金刚石膜/硅复合材料作为MSGC基板的可行性。采用热丝辅助化学气相沉积(HFCVD)技术和相关退火工艺获得了金刚石膜/硅复合材料,并采用SEM、Raman光谱仪、微电流仪对复合材料的表面状况、结构、I V和C F特性进行了表征。结果表明,该复合材料经抛光后表面平整,退火后电阻率达约2.9×1010Ω·cm,电容值小且随频率变化稳定,均满足MSGC对基板材料的要求。     

立式高真空MOCVD装置CaN外延生长与器件制备

自行设计了一套具有创新性的研究型立式高真空MOCVD装置,能够较好的调节反应气体的流动状态,从而在衬底上生长大面积均匀的外延层.利用该装置在蓝宝石和硅单晶衬底上成功地生长出高质量的GaN晶体薄膜.在蓝宝石衬底上生长出n、p型GaN以及多量子阱多层结构材料,并成功制备了GaN基多层量子阱结构的蓝光发光二极管,性能良好,具有实用价值.     

Fe3Si基合金的制备及应用研究进展

Ｆｅ３Ｓｉ基合金具有优异的软磁性能,不仅有希望硅钢片（在高频信息领域）,而且还广泛用作音几视频磁头材料和卡片阅读器用磁头材料。本文综述了Ｆｅ３Ｓｉ基合金的制备工艺及应用,并结合我们的研究工作,分析了其研究现状,简要论述了其发展前景。     

定向生长碳纳米管阵列的制备及其应用研究进展

碳纳米管在力、热、光、电等方面都显示出独特的性质，受到众多领域专家的广泛关注，而定向生长的碳纳米管阵列的获得具有更深远的科学意义。详细介绍了国内外定向生长碳纳米管阵列的制备方法，重点阐述了化学气相沉积法（CVD）的制备流程和生长机理以及其工艺参数对生成碳管阵列的影响。简要论述了碳纳米管阵列在几个典型应用领域的研究进展。     

Fabrication of Hierarchical Pillar Arrays from Thermoplastic and Photosensitive SU‐8

By exploiting the thermoplastic and photosensitive nature of SU‐8 photoresists, different types of hierarchical pillar arrays with variable aspect ratios are fabricated through capillary force lithography (CFL), followed by photopatterning. The thermoplastic nature of SU‐8 enables the imprinting of micropillar arrays with variable aspect ratios by CFL using a single poly(dimethylsiloxane) mold, simply by tuning the initial film thickness of SU‐8 on a substrate. The pillar array is subsequently photopatterned through a photomask, followed by post‐exposure baking above the glass transition temperature (T_g) of SU‐8. The pillars in the exposed region become highly crosslinked and, therefore, neither soluble nor able to reflow above T_g, whereas the pillars in the unexposed regions can reflow and flatten out. Two developing strategies are investigated after UV exposure of the SU‐8 pillar arrays including i) solvent development and drying and ii) thermal reflow to create bilevel hierarchical structures with short pillars and single‐level, dual‐scaled, high‐aspect‐ratio (up to 7.7) pillars in a microdot array, respectively.     

Ordered Arrays of Nanostructures and Applications in High‐Efficient Nano‐Generators

Large‐scale ordered nanostructure arrays on substrates, including nanowires, nanotubes, nanodots, and nano‐holes, can be fabricated using template fabrication processes. The controllable structural parameters and properties of the ordered nanostructure arrays make them quite suitable to be used in many device‐related application areas. It is shown that large‐scale nanowire arrays are good candidates for the realization of a nano‐generator based on the piezoelectric effect of ZnO nanowires. The mechanism of a proposed high‐efficient nano‐generator based on an assembled nanowire/nanohole embedded structure shows high application potentials for biological and nanometer‐sized devices.     

Design and Fabrication of Ceramic Catalytic Membrane Reactors for Green Chemical Engineering Applications

Catalytic membrane reactors (CMRs), which synergistically carry out separations and reactions, are expected to become a green and sustainable technology in chemical engineering. The use of ceramic membranes in CMRs is being widely considered because it permits reactions and separations to be carried out under harsh conditions in terms of both temperature and the chemical environment. This article presents the two most important types of CMRs: those based on dense mixed-conducting membranes for gas separation, and those based on porous ceramic membranes for heterogeneous catalytic processes. New developments in and innovative uses of both types of CMRs over the last decade are presented, along with an overview of our recent work in this field. Membrane reactor design, fabrication, and applications related to energy and environmental areas are highlighted. First, the configuration of membranes and membrane reactors are introduced for each of type of membrane reactor. Next, taking typical catalytic reactions as model systems, the design and optimization of CMRs are illustrated. Finally, challenges and difficulties in the process of industrializing the two types of CMRs are addressed, and a view of the future is outlined.